nixCraft Linux & Unix - Newsletter 24/July/2019

[nixCraft]

Welcome to nixCraft Linux/Unix newsletter for Wednesday, 24 July 2019. I hope you will enjoy this version of the newsletter.

• Raspberry PI 4 Released – Complete specs and pricing
  A new version of the Raspberry PI 4 model has been released, and it is incredible update over the older model. A few years ago, I got Raspberry Pi 3 . It was my first 64-bit ARM board. It came with a 64-bit CPU. Here are the complete specs for an updated 64-bit credit card size Raspberry PI 4 desktop computer level of performance.
   
• Can I delete /var/cache/apt/archives for Ubuntu/Debian Linux?
  I noticed that /var/cache/apt/archives/ taking lots of disk space on my AWS EC2 cloud server powered by Debian Linux. Can I delete /var/cache/apt/archives/ folder? Is it safe to remove all files? Do we absolutely necessary to keep all these files?
   
• How to install LAMP on Debian 10 (Buster)
  How do I install a LAMP stack on Debian 10 (Buster)?
   
• Debian 10 Set Up OpenVPN Server In 5 Minutes
  I am a new Debian Linux 10 server user. How do I set up an OpenVPN Server on Debian Linux version 10 server to shield my browsing activity from bad guys on public Wi-Fi, and more?
   
• How to upgrade Debian 9 to Debian 10 Buster using the CLI
  I have Debian 9.x installed on AWS EC2. How do I upgrade Debian 9 Stretch to Debian 10 Buster using the apt command/apt-get command CLI? How can I upgrade Debian 9 to Debian 10 using ssh client?
   
• How to check open ports in Linux using the CLI
  I need to list all open ports in Linux cloud server. How do I check open ports in Linux using the CLI? Can you give me the command to check open ports in Linux operating system?
   
• How to set up automatic updates for Ubuntu Linux 18.04
  How do I configure automatic updates for Ubuntu Linux 18.04 LTS “Bionic Beaver” server?
   
• Disable SELinux on CentOS 7 / RHEL 7 / Fedora Linux
  I need to disable SELinux on CentOS 7. How can I disable SELinux from the command line over ssh based session?
   
• How to delete a UFW firewall rule on Ubuntu / Debian Linux
  How do I remove and delete a UFW firewall rule running on Ubuntu or Debian Linux?
   
• How to change hostname on Debian 10 Linux
  How do I change the hostname of a Debian Linux 10 “Buster” operating system permanently using the command line tools?
   
• Fedora Linux install vnstat network traffic monitor
  How do I install vnstat network traffic monitor on Fedora Linux system to monitor my hourly, daily, weekly, and monthly bandwidth usage?
   
• How to check CPU temperature in OpenSUSE Linux
  How do I check CPU temperature in OpenSUSE Linux using a command line and GUI tools on my Thinkpad laptop?
   
• How do I force delete a directory in Linux?
  I am trying to delete a directory in Linux using the rmdir dir1 command. But, I am getting an error that read as follows, "rmdir: failed to remove dir1: Directory not empty". How do I force remove and delete a directory in Linux?
   
• How to determine number of CPUs on Linux using command line
  I am a new Linux system admin. How do I obtain the number of CPUs and cores in the Linux system from the command line? How do I determine the number of CPUs on Linux?
   
• Check if a directory exists in Linux or Unix shell
  I need to check if a directory exists or not, within a shell script running on Linux or Unix-like system? How do I check if a directory exists in a shell script?
   
• How To Check Swap Usage Size and Utilization in Linux
  How do I check swap (paging) usage under Linux operating systems using command bash/ksh line options? How do I check swap usage size on Linux operating system?
   
• Debian / Ubuntu: apt-get force reinstall package
  I am a new Debian Linux / Ubuntu Linux LTS user. How do I reinstall a package using apt-get command line? Is there an ‘apt-get force reinstall package’ command?
   
• Linux Execute Cron Job After System Reboot
  I am on Red Hat Enterprise Linux server. Is there is an easy way to run script or command at boot time after fresh reboot command? How can I execute cron job on Linux after system restart?
   
• How To Flush Contents Of a Memcached Server Using Command Line
  I have installed memcached server under Linux, but it is still showing old data. How do I flush the contents of a Memcached instance / server on Linux or Unix-like systems?
   
• Install Speedtest-cli On a CentOS / RHEL / Fedora Linux To Check Internet Speed
  I do not want to use Adobe flash based speed testing site due to security concern on my desktop. How do I install Speedtest-cli on a CentOS Linux or Fedora Linux or Red Hat Enterise Linux (RHEL) for checking the Internet speed?

Until next time.

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